A cyclonic storm of the "Alberta" type, moving eastward along the Canadian border was accompanied by gales of extraordinary violence in the Missouri valley on Sunday, November 12, 1933. Day-time turbulence carried immense quantities of dust into the air. The diverging cold-air-mass following the storm center carried the dust cloud to the Appalachian and Gulf states by the morning of the 13th, after which it was lost sight of in mists and light rain in the mountains, and by dispersion elsewhere.

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